P0050

HO2S Heater Control Circuit Bank 2 Sensor 1

Q: Is it safe to drive with P0050?

Yes. Drivability is normal; the effects are a slower warm-up to closed-loop and an emissions-test failure.

Q: Can I just clear P0050?

It returns once the heater circuit is re-tested. Replace the sensor or repair the wiring to clear it for good.

Emissions / O2 sensor Generic OBD-II Medium

What it means

P0050 means the ECM has detected a fault in the heater control circuit of the upstream oxygen sensor on bank 2 (sensor 1). The heater brings the sensor to temperature quickly so it can read accurately soon after start-up. The engine still runs normally, but the car takes longer to reach closed-loop fueling and won't pass an emissions test until the heater circuit is repaired.

Medium

Can I keep driving? Safe to drive — the fault is in the sensor's heater circuit, so it mainly delays closed-loop fueling and affects emissions, not how the car runs.

Real-world scan data

Seen in

248

scans in the past year

Found in

<0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P0050 scans

P0030in 40.3% of scans

P0036in 29.0% of scans

P0056in 22.6% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Will fail an emissions/readiness test
Slightly worse fuel economy until the sensor warms up

Common causes

Most likely first

Failed heater element inside the bank 2, sensor 1 oxygen sensorLikely
Corroded or damaged wiring/connector in the heater circuitCommon
Blown O2 heater fuseCommon
Failed ECM driver (least likely)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data, then inspect the upstream (bank 2, sensor 1) O2 sensor connector and heater wiring.
Check the O2 heater fuse and the heater circuit for an open or short.
Measure the sensor's heater resistance; replace the sensor if the element is open or out of spec.
Consider the ECM driver only after wiring, fuse and sensor test good. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0050?+

Yes. Drivability is normal; the effects are a slower warm-up to closed-loop and an emissions-test failure.

Can I just clear P0050?+

It returns once the heater circuit is re-tested. Replace the sensor or repair the wiring to clear it for good.

Read & clear P0050 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX